(Youtube has tutorials on how to change these, it's very easy :).
eBay
Mini GPS Keys Finder Global Tracker Works with Find My APP Anti Lost Reminder Device for Apple Tag Replacement Locator MFI Rated
Aliexpress UK
This is for one key and hinge.
eBay
Aocarmo For Apple iPhone 15 Pro Max 15Pro 15PM Power On Off Volume Button Mute Key Replacement Parts Complete Set
Aliexpress UK
This is for MX Keys for Mac standard board. I have tested the connection to Bluetooth and Unifying receiver which both work.
eBay
Hello KT Bluetooth Earphone Case for AirPods4 Earphones for Apple AirPods 1/2 3 Pro2 Bluetooth Earphone Case Replacement Keyring
Aliexpress UK
The price is per each piece/key, not full keyboard. If you want to buy more than 1 key, then buy the amount of keys you need. The keys are all in excellent condition, see the images. THE PRICE IS PER PIECE, NOT FULL KEYBOARD.
eBay
2Pcs Strap Release Button Spring Buckle Key Replacement Parts For Apple Watch Series 4 5 6 7 8 9 Series6 Series5 41mm 45mm 40mm
Aliexpress UK
BLACK Model no YR0073. These keys are coming from a Genuine Logitech MX Keys. All keys are in GOOD condition. If it is not correct then we aren’t responsible. If you need any extra parts e.g., Plunger then you must ask.
eBay
Apple Airtag Replacements 1 2 3 4 Pack Anti Loss Tracker Find My GPS Bluetooth for Baggage IOS MFi Key Detector
Aliexpress UK
For Apple A1243 Wired Keyboard. includes Hinge. Genuine Apple parts.
eBay
Fashion Fruit Keyring Keychain Button Hollow Heart Keyring Apples Keyring ButtonJewelry Backpack
Aliexpress UK
Process: Using high-precision steel abrasive injection molding process, no cracking, no fading, no oil stains, more accurate details, corrosion resistance, heat resistance, oil resistance, and can maintain the early state of the keycap.
eBay
3-10PCS Rainbow Split Ring Heart Star Apple Keychains Metal Key Chain Ring Split Rings Unisex Keyring Keyfob Accessories DIY
Aliexpress UK
Process: Using high-precision steel abrasive injection molding process, no cracking, no fading, no oil stains, more accurate details, corrosion resistance, heat resistance, oil resistance, and can maintain the early state of the keycap.
eBay
Air Keychain,Key Organizer Works with Apple Find My, Built-in airtag Chips,Car Key Chains with GPS Tracker, Key Finder(iOS Only)
Aliexpress UK